Improved process for preparing paper-stock from wood



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W'in emes:

UNITED STATES PATENT OFFICE,

JACOB H. HAWES, OF STOCKBRIDGE, MASSACHUSETTS, ASSIGNOB TO THE HAWESPATENT W'OOD PULP COMPANY, OF SAME PLACE.

IMPROVED PROCESS FOR PREPARING PAPER-STOCK FROM WOOD.

Specification forming part of Letters Patent N0. 89,220, dated April 20,1869.

To all 'whom 'it may concern:

Be it known that I, JACOB H. HAWES, of Stockbridge, in the'county ofBerkshire and State of Massachusetts, have invented a new and usefulProcess for Preparing Paper-Stock, of which the following is a full,clear, and eX- act description, reference being had to the accompanyingdrawing, forming part of this specification, in whicli- Figures l and 2represent side and front views of a block of wood as it is preferred tocut or shape it for reduction into paper-stock according to my improvedprocess, and showing by red and blue lines the presentation or relativeposition of the same to the reducing-surface.

This my invention consists in preparing paperstock by a grating process,as contradistinguished from grinding, rasping, or shaving;

and it furthermore consists in so preparing paper-stock from wood asthat the reduction of the latter is effected under a compound obliquityas regards -the direction of its ber to the grating-surface-that is, asfor instance, where the grater is made to reciprocate in a straightline, oblique to the plane ofthe grating-surface, and oblique to theline of motion or direction in travel of the grater.

To illustrate by reference to the accompanying drawing, I take, forinstance, a block of wood, A, squared or cut in reference to its ber asrepresented in said drawing, s being the side or surface which isdesigned to be presented to the action of the grater, the line windicating the plane of the gratingsurface, and the line z the line ordirection of its reciprocatin g travel. Said block, being suitablyguided or held to secure such presentation to the grater, iscontinuously forced up against the latter, giving at the same time, ifdesired, a slight or slow cross-reciprocating movement to said block, toprevent the grater during its travel grooving the wood.

By the compound Obliquity which the block A, as regards its fiber,presents to the surface and travel of the grater, I nd that a moreperfect reduction of the wood without injury to its ber is secured; butthe reduction may be effected by a straight presentation of the ber tothe grater, that may either be of a reciprocating or rotary character.

By grating wood to form paper-stock, the same, by reason of the sharpand peculiar character of the grating-surface, is reduced much moreperfectly than is attainable either by grinding or rasping, while thereduced particles are passed off through the interstices in or openprotuberances of the grater as fast as they are grated from the wood,thus keeping both the wood and grating-surface clear.

It is not necessary here to describe any particular mechanism for thusreducing wood to make paper-stock, as such may be varied, but thefollowing will answer: Thus, I take two at graters and arrange themparallel to each other on a reciprocating frame or slide, the graterslying' back to back, but separated by escape-passages for the reducedwood. Againstthe faces of these graters the blocks of wood are made topress, and are continuously forced up by means of followers, operated byweights or springs, said blocks being preferably arranged incompartments made in frames, that have a slight or slow reciprocatingmovement given them in a crosswise direction to the travel of thegraters.

What is here claimed, and desired to be secured by Letters Patent, is-

1. The process of preparing paper-stock from wood by gratin g it,substantially as specified.

2.- In preparing paper-stock from wood by grating it, so presenting theblock of wood to the grater as that its fibers are made to lie obliqueto the plane of the grating-surface, and also to the travel of thegrater, essentially as shown and described.

JACOB H. HAVES.

